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G. E. HART.

COMPENSATION WATCH BALANCE.

No. 293,169. Patented Feb. 5, 1884.

OM% W UNITED STATES PATENT OFFICE.

GEORGE E. HART, OF VATERBURY, COXNECTICUT, ASSIGXOR TO THE \VATERBURY WATCH COMPANY, OF SAME PLACE.

COMPENSATION WATCH-BALANCE.

SPECIFICATION forming part of Letters Patent No. 293,169, dated February 5, 1E4.

Application filed September 10, 1883.

To all whom it may concern.-

Be it known that I, GEORGE E. HART, of aterbury, in the county of New Haven, and in the State of Connecticut, have invented certain new and useful Improvementsin \Vatch- Balances; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, making a part of this specification, in WlJlOll I Figure 1 is a perspective View of the upper side of my improved balance, and Fig. 2 is a like View of the bottom side of the same; and Fig. 3 is a crosssection of said balance upon a central line.

Letters of like name and kind refer to like parts in each of the figures.

The design of my invention is to enable watch-balances to be more easily and cheaply constructed than has heretofore been practicable; and to this end said invention consists in a watch-balance composed of brass, with the inner half of its rim coated with deposited nickel or platinum, substantially as and for the purpose hereinafter specified.

In the construction of my balance A, the rim a and arm a are formed from brass, in the usual manner. The said rim is then provided with radial threaded openings for the reception of adjusting-screws a, and said balance (X0 model.)

is then coated with nickel or platinum, preferably deposited by an electric battery. The balance is next placed in alathe, and the plating removed from the periphery and from a portion of the edgeof the rim (1, after which said rim is cut and the screws inserted. The portion of the rim (4 covered with nickel or platinum is less easily affected by changes of temperature than is the portion Where the brass is exposed, and by properly proportioning the areas of the plated and plain parts of said rim the greater expansion and contraction of the latter can be made to so change the form of said rim asto preserve the general size of the balance and prevent changes in the time-rate of a Watch to which it is applied.

Having thus fully set forth the nature and merits of my invention, what I claim as new is A watch-balance composed of brass, with the inner surface and a portion of the edges of its rim coated with deposited nickel or platinum, substantially as and for the purpose specified.

In testimony that I claim the foregoing I have hereunto set my hand this 20th day of July, 1883.

GEORGE E. HART.

it nesses:

E. L. BRONSOX, s GEO. S. PRINDLE. 

